The radius of the disk is R, and the mass of the disk is M. Using the parallel axis theorem and theequation for the moment of inertia of a disk about its central axis developed in the previous example, Eq. (8), the moment of inertia of the disk about the specified axis is Fig.
Short Circuits. Short circuits are the second most common reason for breaker tripping and are a more serious concern. Short circuits occur when the black hot wires inside your electrical service panel come in contact with either other hot wires or neutral wires.
Example of voltage in a simple direct current (dc) circuit: 1  In this dc circuit, the switch is closed (turned ON). 2  Voltage in the power sourceâthe âpotential differenceâ between the batteryâs two polesâis activated, creating pressure that forces electrons to flow as current out the batteryâs negative terminal. Current reaches the light, causing it to glow. Current returns to the power source.